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Poly (vinyl chloride) processing morphology
Author(s) -
Rabinovitch Elvira B.,
Summers James W.
Publication year - 1980
Publication title -
journal of vinyl technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.295
H-Index - 35
eISSN - 1548-0585
pISSN - 0193-7197
DOI - 10.1002/vnl.730020307
Subject(s) - agglomerate , torque , particle (ecology) , particle size , materials science , vinyl chloride , morphology (biology) , range (aeronautics) , viscosity , mixing (physics) , composite material , acetone , chemical engineering , chemistry , thermodynamics , physics , organic chemistry , polymer , engineering , oceanography , genetics , quantum mechanics , biology , copolymer , geology
Abstract This paper describes how morphology of PVC changes in the Brabender mixing head. At the range of temperatures used for PVC processing, the Brabender torque‐time curve shows minimum torque and maximum torque. The minimum torque is associated with a breakdown of 150 μm PVC grains and 10 μm agglomerates resulting in the release of the 1μm primary particles. The torque increases from minimal interaction between primary particles to the point where primary particles agglomerate at maximum torque so that fibriles can be formed when PVC samples are swollen in acetone and sheard. Further heating reduces the viscosity resulting in lower torque even though residual primary particles still exist with much particle to particle interaction. Primary particle structure disappears at about 215° C with complete melting.